Variation of the electron-spin polarization in EuSe tunnel junctions from zero to near 100% in a magnetic field

1993 ◽  
Vol 70 (6) ◽  
pp. 853-856 ◽  
Author(s):  
J. S. Moodera ◽  
R. Meservey ◽  
X. Hao
Keyword(s):  
Magnetic Field ◽  
Spin Polarization ◽  
Electron Spin ◽  
Tunnel Junctions ◽  
Electron Spin Polarization

Effective Nuclear Field Measurement in a Single Quantum Well via Time-Resolved Kerr Rotation Technique

2014 ◽  
Vol 936 ◽  
pp. 534-539
Author(s):  
Li Ping Yan ◽  
Reina Kaji ◽  
Satoru Adachi
Keyword(s):  
Magnetic Field ◽  
Quantum Well ◽  
Spin Polarization ◽  
Electron Spin ◽  
Electron Spin Polarization ◽  
Spin Component ◽  
Kerr Rotation ◽  
Time Resolved ◽  
Dephasing Time ◽  
Nuclear Field

Effective magnetic field of nuclear spin polarization (NSP) under circularly polarized pumps excitation and the dephasing time of resident electron spin polarization under pump and control excitation has been detected in a single CdTe quantum well (QW) by a time-resolved Kerr rotation (TRKR) technique. We deduced that the experimental method is verified with the effect, to a certain extent, through confirming the external magnetic field results. In addition, the nuclear field is revealed to be increased with the increasing electron spin component due to the enhanced electron-nuclear hyperfine interaction. Significant nuclear field is observed as 1.85 mT with the applied magnetic field tilted by about 15 degree. What is more, we found the spin dephasing time (SDT) has little relation with the created NSP field, but it decreases largely with the increasing spin polarization magnitude under pump excitation and the spin vector dispersions induced by control pulses.

Electron-Spin Polarization in Tunnel Junctions with Ferromagnetic EuS Barriers

1989 ◽  
Vol 151 ◽  
Author(s):  
Xin Hao ◽  
J. S. Moodera ◽  
R. Meservey
Keyword(s):  
Curie Temperature ◽  
Spin Polarization ◽  
Electron Spin ◽  
Tunnel Junctions ◽  
Zeeman Splitting ◽  
Aluminum Film ◽  
Electron Spin Polarization ◽  
Magnetic Polarization ◽  
Tunnel Current ◽  
Metal Electrodes

ABSTRACTSpin-resolved tunneling in the structure metal-EuS-metal has been obtained. The metal electrodes used in our experiments being non-magnetic, polarization of the tunnel current is attributed to the conduction band splitting in EuS below its ferromagnetic Curie temperature. Enhanced Zeeman splitting in the superconducting aluminum film is also observed.

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